#NextGenATP star Alexander Zverev saved three match points and came back from a set down to beat American John Isner 6-7(5), 7-6(6), 7-6(5) on Monday at the Miami Open presented by Itau. The win pushes Zverev through to the fourth round of an ATP World Tour Masters 1000 tournament for the second time. He also reached the round of 16 last year in Indian Wells (l. to Nadal).

On Stadium Court against Isner, the 19-year-old German was down match points at 5/6 in the second-set tie-break and 4-5, 15/40 in the third set. But the 6’6” right-hander erased them all, and on his first match point, Isner sailed a backhand long. Zverev raised his arms to the sky in celebration after the two-hour and 38-minute contest.

Zverev will face top seed Stan Wawrinka, who beat Tunisia’s Malek Jaziri 6-3, 6-4. Zverev beat Wawrinka during their only other FedEx ATP Head2Head meeting, the St. Petersburg Open final last year.

Nick Kyrgios, another top young player on the ATP World Tour, also advanced after a three-set battle against a big-serving veteran. The 21-year-old Aussie outlasted 6’11” Ivo Karlovic 6-4, 6-7(4), 7-6(2) in two hours and 26 minutes.

Kyrgios failed to convert all seven break chances in the second set, but the 12^th seed stayed the course in the decider and came through to reach the fourth round. Kyrgios will next meet eighth seed David Goffin, who beat Argentine Diego Schwartzman 4-6, 6-3, 7-5 in two hours and 32 minutes.

 Watch Full Match Replays

Roger Federer added another big win to his nearly invincible 2017 on Monday, fighting off Argentine Juan Martin del Potro 6-3, 6-4 to advance to the fourth round of the Miami Open presented by Itau.

Federer, a two-time Miami champion (2005-06), never lost his serve against the powerful right-hander, who had five break chances but couldn’t convert any of them. The win improves Federer to 15-1 on the season and 46-13 for his career at the ATP World Tour Masters 1000 tournament.

Federer also extends his FedEx ATP Head2Head series lead against del Potro to 16-5. Perhaps more impressive, the Swiss star adds del Potro’s name to his list of defeated opponents during his comeback season, a ledger that also includes Top 10 players Stan Wawrinka, Kei Nishikori and Rafael Nadal.

In the round of 16, Federer will try to add 14^th seed Roberto Bautista Agut to that list. The Spaniard came back to beat American Sam Querrey 3-6, 6-2, 6-3 in one hour and 55 minutes.

The third-round showdown between Federer and del Potro was their first meeting since the round-robin stage of the 2013 ATP Finals, but they renewed their rivalry with vigor from the start on Monday afternoon. Federer sought to stay away from del Potro’s rocket forehand, targetting the backhand wing and seeking to catch del Potro favouring that side. Del Potro looked to crush his best stroke as often as he could.

But it was the 35-year-old Federer, as he has been all season long, who was more on point in front of a packed and boisterous crowd on Stadium Court. After failing to convert two break points at 3-2, Federer seized the occasion in the eighth game, ripping a forehand past del Potro, who left a backhand slice too short to challenge Federer.

Serving at 5-3, the fourth-seeded Swiss erased four break points and finished the set with a backhand drop shot that del Potro could only watch. Federer didn’t wait long to break in the second set, taking advantage of his first opportunity to go up 3-2. One break was all he would need as he served out their 20^th FedEx ATP Head2Head meeting to love.

 Watch Full Match Replays

Former finalist Tomas Berdych powered into the fourth round of the Miami Open presented by Itaú on Monday as he defeated Gilles Muller 6-3, 6-4.

The 10^th-seeded Czech won 76 per cent of his service points and converted two of his four break point chances to wrap up victory in 84 minutes, avenging the defeat he suffered to Muller in Tokyo last year.

The 31-year-old Berdych was runner-up at this ATP World Tour Masters 1000 tournament in 2010, losing out to Andy Roddick. He has also reached the semi-finals on three further occasions. The right-hander goes on to face either #NextGenATP star Borna Coric or Adrian Mannarino.

Roger Federer is in action later. The Swiss faces Juan Martin del Potro in a blockbuster third-round clash. 

 Watch Full Match Replays

View FedEx ATP Head2Head for the following match-ups & vote for the players you think will win!
Federer vs del Potro | Kyrgios vs Karlovic | Isner vs Zverev 

• DAY 6 PREVIEW: Third round action on Monday at the Miami Open, presented by Itau, continues with both Swiss superstars in Stadium court action. No. 1 Stan Wawrinka and No. 4 Roger Federer are the only remaining Emirates top-ten players in the top half of the draw. Two more top-ten seeds are in action today—No. 8 David Goffin and No. 10 Tomas Berdych—along with U.S. stars No. 18 John Isner and No. 22 Sam Querrey.

In the opening men’s match on Stadium, Federer squares off against long-time rival No. 29 seed Juan Martin del Potro. The pair has played twenty times, but this is their first meeting since the 2013 Barclays ATP World Tour finals, where Federer defeated the Argentine in round-robin play. Del Potro has won three of the last five encounters, but the Swiss has emerged victorious all five times the pair has met at Masters 1000 series events.

In the last day session match, Isner will try to exact revenge on German #NextGen star Alexander Zverev, who beat him last fall in Shanghai, their only previous meeting. Isner reached the semi-finals here two years ago (l. to Djokovic), while Zverev is charting new territory, playing in the Miami third round for the first time.

In the evening session, Wawrinka will take on Tunisian Malek Jaziri, who ousted No. 31 seed Lopez on Saturday. Jaziri is looking for his first-ever victory against an Emirates top-ten opponent (0-9), and is facing the Swiss for the first time. Wawrinka is playing his first Masters-level event as the top seed, and is aiming to reach the quarter-finals in order to top his previous best showing here (2009, 2014 4th round).

On Grandstand, 2010 finalist Berdych takes on No. 24 Gilles Muller in their second career encounter. Muller beat the Czech last fall in Tokyo. Next up, Querrey goes for the upset against No. 14 Roberto Bautista Agut, who has defeated him twice in the past. The third men’s match is sure to be a big-serving clash between No. 12 Nick Kyrgios and No. 17 Ivo Karlovic. The Australian has won both previous encounters. Closing the day’s Grandstand action is Goffin against Diego Schwartzman, the No. 2 ranked Argentine, who upset Ferrer on Saturday. The head-to-head is knotted at one, and Schwartzman won the last match, in last year’s Antwerp semi-finals.

On Court 1, #NextGen Croat Borna Coric faces the French left-hander Adrian Mannarino, both of whom hold a losing record on the season. Each player needed to score an upset to reach the round of 32: Coric ousted No. 6 seed Thiem, and Mannarino surprised No. 32 Lorenzi. Mannarino reached the 4th round here in 2015 (d. Wawrinka, l. to Thiem), while Coric is making his first third-round appearance.

View Full Media Notes

Jack Sock recorded yet another win this season on Sunday at the Miami Open presented by Itau, fighting hard under the lights to defeat Jiri Vesely 6-3, 7-6(0) and reach the round of 16.

A single break of serve was all the 13^th seed needed to take the opening set. Vesely raced to a 5-3 lead in the second set, but Sock fought back to level the match and was dominant throughout the tie-break. A volley winner on his first match point wrapped up the contest after one hour and 39 minutes. Sock improves his FedEx ATP Head2Head record against Vesely to 2-0.

 Watch Full Match Replays

The American moves to 9-2 in tie-breaks this season. He also boosts his win-loss record to 17-3, tying Grigor Dimitrov, Jo-Wilfried Tsonga and Dominic Thiem for most match wins this season.

Next up for Sock is #NextGenATP American Jared Donaldson, who moved into the fourth round when third seed Milos Raonic withdrew before taking the court due to a hamstring injury.